Παραπομπή APA

Marshak, S. (2004). Essentials of geology. W.W.Nosrton & Company.

Παραπομπή Chicago Style

Marshak, Stephen. Essentials of Geology. New York: W.W.Nosrton & Company, 2004.

Παραπομπή MLA

Marshak, Stephen. Essentials of Geology. W.W.Nosrton & Company, 2004.